Fix T92864: curve object does not sync correctly in cycles

The issue was that the `object_is_geometry` method was used in two different
contexts that expected the function to behave differently. So a recent change
that fixed `object_is_geometry` for one context, broke it for the other context.
The two contexts are:
* Check if a "real" object can contain a geometry to check if it has to be tagged
  for sync after an update.
* Check if an object/instance actually is a geometry that cycles can work with.

I created a new `object_can_have_geometry` method for the first use case, instead
of trying to adapt the existing object_is_geometry method to serve both uses.
Additionally, I changed it so that a BObjectInfo is passed into `object_is_geometry`
to make it more explicit when this method is supposed to be used.

Differential Revision: https://developer.blender.org/D13135

3 files changed, 28 insertions, 9 deletions

diff --git a/intern/cycles/blender/object.cpp b/intern/cycles/blender/object.cpp
index 698800f9957..0ad3e551b8d 100644
--- a/intern/cycles/blender/object.cpp
+++ b/intern/cycles/blender/object.cpp
@@ -62,15 +62,15 @@ bool BlenderSync::BKE_object_is_modified(BL::Object &b_ob)
   return false;
 }
 
-bool BlenderSync::object_is_geometry(BL::Object &b_ob)
+bool BlenderSync::object_is_geometry(BObjectInfo &b_ob_info)
 {
-  BL::ID b_ob_data = b_ob.data();
+  BL::ID b_ob_data = b_ob_info.object_data;
 
   if (!b_ob_data) {
     return false;
   }
 
-  BL::Object::type_enum type = b_ob.type();
+  BL::Object::type_enum type = b_ob_info.iter_object.type();
 
   if (type == BL::Object::type_VOLUME || type == BL::Object::type_HAIR) {
     /* Will be exported attached to mesh. */
@@ -87,6 +87,24 @@ bool BlenderSync::object_is_geometry(BL::Object &b_ob)
   return b_ob_data.is_a(&RNA_Mesh);
 }
 
+bool BlenderSync::object_can_have_geometry(BL::Object &b_ob)
+{
+  BL::Object::type_enum type = b_ob.type();
+  switch (type) {
+    case BL::Object::type_MESH:
+    case BL::Object::type_CURVE:
+    case BL::Object::type_SURFACE:
+    case BL::Object::type_META:
+    case BL::Object::type_FONT:
+    case BL::Object::type_HAIR:
+    case BL::Object::type_POINTCLOUD:
+    case BL::Object::type_VOLUME:
+      return true;
+    default:
+      return false;
+  }
+}
+
 bool BlenderSync::object_is_light(BL::Object &b_ob)
 {
   BL::ID b_ob_data = b_ob.data();
@@ -189,7 +207,7 @@ Object *BlenderSync::sync_object(BL::Depsgraph &b_depsgraph,
   }
 
   /* only interested in object that we can create meshes from */
-  if (!object_is_geometry(b_ob)) {
+  if (!object_is_geometry(b_ob_info)) {
     return NULL;
   }
 
diff --git a/intern/cycles/blender/sync.cpp b/intern/cycles/blender/sync.cpp
index ffd1e78b7f8..92662e37bc2 100644
--- a/intern/cycles/blender/sync.cpp
+++ b/intern/cycles/blender/sync.cpp
@@ -162,19 +162,19 @@ void BlenderSync::sync_recalc(BL::Depsgraph &b_depsgraph, BL::SpaceView3D &b_v3d
     /* Object */
     else if (b_id.is_a(&RNA_Object)) {
       BL::Object b_ob(b_id);
-      const bool is_geometry = object_is_geometry(b_ob);
-      const bool is_light = !is_geometry && object_is_light(b_ob);
+      const bool can_have_geometry = object_can_have_geometry(b_ob);
+      const bool is_light = !can_have_geometry && object_is_light(b_ob);
 
       if (b_ob.is_instancer() && b_update.is_updated_shading()) {
         /* Needed for e.g. object color updates on instancer. */
         object_map.set_recalc(b_ob);
       }
 
-      if (is_geometry || is_light) {
+      if (can_have_geometry || is_light) {
         const bool updated_geometry = b_update.is_updated_geometry();
 
         /* Geometry (mesh, hair, volume). */
-        if (is_geometry) {
+        if (can_have_geometry) {
           if (b_update.is_updated_transform() || b_update.is_updated_shading()) {
             object_map.set_recalc(b_ob);
           }
diff --git a/intern/cycles/blender/sync.h b/intern/cycles/blender/sync.h
index 7e5d0324ca9..98197564bec 100644
--- a/intern/cycles/blender/sync.h
+++ b/intern/cycles/blender/sync.h
@@ -208,7 +208,8 @@ class BlenderSync {
   /* util */
   void find_shader(BL::ID &id, array<Node *> &used_shaders, Shader *default_shader);
   bool BKE_object_is_modified(BL::Object &b_ob);
-  bool object_is_geometry(BL::Object &b_ob);
+  bool object_is_geometry(BObjectInfo &b_ob_info);
+  bool object_can_have_geometry(BL::Object &b_ob);
   bool object_is_light(BL::Object &b_ob);
 
   /* variables */